On 23/08/17 21:15, Zhoujie Wu wrote:
> From: Hu Ziji <huziji@xxxxxxxxxxx>
>
> Support HS400 Enhanced Strobe feature in Xenon.
>
> Enable Enhanced Strobe together with Data Strobe.
> Disable Enhanced Strobe when eMMC is not in HS400 mode.
>
> Signed-off-by: Hu Ziji <huziji@xxxxxxxxxxx>
> Signed-off-by: Zhoujie Wu <zjwu@xxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-xenon-phy.c | 34 ++++++++++++++++++++++++++++------
> drivers/mmc/host/sdhci-xenon.h | 1 +
> 2 files changed, 29 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
> index f7e26b0..ec87943 100644
> --- a/drivers/mmc/host/sdhci-xenon-phy.c
> +++ b/drivers/mmc/host/sdhci-xenon-phy.c
> @@ -409,17 +409,30 @@ static int xenon_emmc_phy_config_tuning(struct sdhci_host *host)
> return 0;
> }
>
> -static void xenon_emmc_phy_disable_data_strobe(struct sdhci_host *host)
> +static void xenon_emmc_phy_disable_strobe(struct sdhci_host *host)
> {
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> u32 reg;
>
> - /* Disable SDHC Data Strobe */
> + /* Disable both SDHC Data Strobe and Enhanced Strobe */
> reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
> - reg &= ~XENON_ENABLE_DATA_STROBE;
> + reg &= ~(XENON_ENABLE_DATA_STROBE | XENON_ENABLE_RESP_STROBE);
> sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);
> +
> + /* Clear Strobe line Pull down or Pull up */
> + if (priv->phy_type == EMMC_5_0_PHY) {
> + reg = sdhci_readl(host, XENON_EMMC_5_0_PHY_PAD_CONTROL);
> + reg &= ~(XENON_EMMC5_FC_QSP_PD | XENON_EMMC5_FC_QSP_PU);
> + sdhci_writel(host, reg, XENON_EMMC_5_0_PHY_PAD_CONTROL);
> + } else {
> + reg = sdhci_readl(host, XENON_EMMC_PHY_PAD_CONTROL1);
> + reg &= ~(XENON_EMMC5_1_FC_QSP_PD | XENON_EMMC5_1_FC_QSP_PU);
> + sdhci_writel(host, reg, XENON_EMMC_PHY_PAD_CONTROL1);
> + }
> }
>
> -/* Set HS400 Data Strobe */
> +/* Set HS400 Data Strobe and Enhanced Strobe */
> static void xenon_emmc_phy_strobe_delay_adj(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -439,6 +452,15 @@ static void xenon_emmc_phy_strobe_delay_adj(struct sdhci_host *host)
> /* Enable SDHC Data Strobe */
> reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
> reg |= XENON_ENABLE_DATA_STROBE;
> + /*
> + * Enable SDHC Enhanced Strobe if supported
> + * Xenon Enhanced Strobe should be enabled only when
> + * 1. card is in HS400 mode and
> + * 2. SDCLK is higher than 52MHz
> + * 3. DLL is enabled
> + */
> + if (host->mmc->ios.enhanced_strobe)
> + reg |= XENON_ENABLE_RESP_STROBE;
> sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);
>
> /* Set Data Strobe Pull down */
> @@ -615,7 +637,7 @@ static void xenon_emmc_phy_set(struct sdhci_host *host,
> sdhci_writel(host, phy_regs->logic_timing_val,
> phy_regs->logic_timing_adj);
> else
> - xenon_emmc_phy_disable_data_strobe(host);
> + xenon_emmc_phy_disable_strobe(host);
>
> phy_init:
> xenon_emmc_phy_init(host);
> @@ -705,7 +727,7 @@ void xenon_soc_pad_ctrl(struct sdhci_host *host,
>
> /*
> * Setting PHY when card is working in High Speed Mode.
> - * HS400 set data strobe line.
> + * HS400 set Data Strobe and Enhanced Strobe if it is supported.
> * HS200/SDR104 set tuning config to prepare for tuning.
> */
> static int xenon_hs_delay_adj(struct sdhci_host *host)
> diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> index 73debb4..01937f1 100644
> --- a/drivers/mmc/host/sdhci-xenon.h
> +++ b/drivers/mmc/host/sdhci-xenon.h
> @@ -33,6 +33,7 @@
> #define XENON_TUNING_STEP_DIVIDER BIT(6)
>
> #define XENON_SLOT_EMMC_CTRL 0x0130
> +#define XENON_ENABLE_RESP_STROBE BIT(25)
> #define XENON_ENABLE_DATA_STROBE BIT(24)
>
> #define XENON_SLOT_RETUNING_REQ_CTRL 0x0144
>
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